Method for preparing activated carbons by using plastics of recycled waste circuit boards as raw material
A technology for preparing activated carbon and waste circuit boards, which is used in electronic waste recycling, recycling technology, and solid waste removal. Energy-saving, automation-friendly effects
Inactive Publication Date: 2011-01-19
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
These treatment methods either have low recycling rates and high treatment costs, or produce waste gas containing dioxins, furans and carbon dioxide during the treatment process, causing serious air pollution
Method used
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Effect test
Embodiment 1
[0042] Using the above-mentioned technological process, using zinc chloride as the activator, under the conditions of microwave power 633W, irradiation time 8min, and zinc chloride volume percentage 40%, the iodine adsorption value of the activated carbon product is 426.8mg / g, methylene blue The adsorption value is 52.4mg / g, and the yield is 37.3%.
Embodiment 2
[0044] Using the above-mentioned technological process, using phosphoric acid as an activator, under the conditions of microwave power 792W, irradiation time 10min, and phosphoric acid volume percentage 30%, the activated carbon product has an iodine adsorption value of 404.8mg / g and a methylene blue adsorption value of 47.2mg. / g, yield 38.1%.
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Abstract
The invention discloses a method for recycling the plastics of waste circuit boards, which comprises the following steps: preparing activated carbons by using the plastics of screened waste circuit boards as a raw material through the methods of chemical activation and microwave heating; then soaking the obtained activated carbons in drug with certain concentration for twenty-four hours, wherein the volume ratio of the plastic powder of the waste circuit boards to the drug is 1:3; activating by putting the activated carbons in a micro-wave oven for radioactivation; carrying out acid-washing on the activated carbons subjected to radioactivation by hydrochloric acid solution with 1:9 in volume ratio so as to remove ashes; rinsing the activated carbons subjected to acid-washing by water so as to regulate the pH value of the activated carbon to be 7; finally, putting the activated carbons in a drying oven, and then crushing the dried activated carbons so as to obtain the finished activated carbon product. The iodine sorption value of the prepared activated carbon product is 404.8 mg / g, the methylene blue sorption value thereof is 47.2 mg / g, and the yield is 38.1 percent. By using the method of the invention, the plastics of waste circuit boards are prepared into activated carbons by using the methods of chemical activation and microwave heating, and the adsorption property of the prepared activated carbon is similar to that of general industrial activated carbons, therefore, the method of the invention is also a new better way for recycling the plastics of waste circuit boards.
Description
technical field [0001] The invention relates to recycling of waste materials, in particular to a method for preparing activated carbon from the recycling of waste circuit board plastics in electronic products. Background technique [0002] Every year, tens of thousands of circuit boards are scrapped in electronic products. These circuit boards contain a large amount of metal. Landfilling is not only a waste of resources, but also will leach highly toxic metal elements and pollute groundwater. Therefore, effective treatment and disposal of waste circuit boards can reduce the volume of pollutants, stabilize dangerous components, and recycle useful components. Waste circuit boards usually contain 30% plastic, and there are five main processing methods: one is to process waste polymer materials directly after classification, cleaning, crushing, and granulation; the other is to process polymer materials through thermal decomposition technology. Carry out pyrolysis, that is, deco...
Claims
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IPC IPC(8): C01B31/12B09B3/00
CPCY02W30/82
Inventor 张德华邓杰宁平
Owner KUNMING UNIV OF SCI & TECH
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